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Search took 0.00 seconds. Search: Posts Made By: Derek Lumb
Forum: Navigation 21-10-2022, 08:38
Replies: 125
Views: 12,389
Posted By Derek Lumb
Re: Are radio direction finders completely obsolete?

RDF may be obsolete for the cruising sailor but RDF is still used by the SAR services to locate a casualty. All the RNLI All Weather lifeboats and the Atlantic 85 inshore lifeboats have direction...
Forum: Electrical: Batteries, Generators & Solar 25-07-2022, 07:32
Replies: 53
Views: 6,431
Posted By Derek Lumb
Re: New AGM batteries - what am I doing wrong?

While any of the suggestions may be part of the problem, another thing to consider is that Lead Acid batteries have a self discharge rate; in other words, left on the shelf they will slowly...
Forum: Lagoon Catamarans 29-10-2018, 07:45
Replies: 45
Views: 10,468
Posted By Derek Lumb
Re: Stray current corroded saildrives

The main issues here are galvanic corrosion and electrolytic corrosion. Galvanic corrosion is caused by the current which flows as a result of two items of different metals which are connected...
Forum: Electrical: Batteries, Generators & Solar 17-05-2016, 10:50
Replies: 16
Views: 3,358
Posted By Derek Lumb
Re: Inverter output cables are live on shore-power?

It looks to me if it is incorrectly wired and dangerous. From your description it sounds as if the shore power cable would be live when the inverter is switched on - this is DANGEROUS. If there were...
Forum: Europe & Mediterranean 21-03-2016, 11:20
Replies: 43
Views: 8,404
Posted By Derek Lumb
Re: Ice and gas availability in Europe

4.5kg Calor Gas bottles are ONLY available in the UK. 2.9kg Camping Gaz bottles are relatively widely available but they are significantly more expensive than UK Calor Gas.
Last year ~£25 for 2.9kg...
Forum: Europe & Mediterranean 21-02-2016, 07:49
Replies: 60
Views: 6,772
Posted By Derek Lumb
Re: Cruising Europe UK this coming summer

You should get an ICC (International Certificate of Competence) which is pretty basic. If you have any RYA quals you can probably just get one issued (cost about £25) - or probaly get one issued in...
Forum: Engines and Propulsion Systems 21-02-2016, 07:36
Replies: 31
Views: 4,907
Posted By Derek Lumb
Re: Not the right prop

Google "propking.xls" which is a free, very comprehensive spreadsheet which will enable you to experiment with the effect of changing pitch, diameter,gearbox ratio etc and will tell you what size...
Forum: Electrical: Batteries, Generators & Solar 10-02-2016, 10:35
Replies: 53
Views: 5,701
Posted By Derek Lumb
Re: How do I connect my new inverter

The thing to bear in mind is that a 350W inverter will pull ~30amps DC at 12v (350/12) so you need a fairly substantial supply point AND switch/breaker or fuse.

The comment about AC being more...
Forum: General Sailing Forum 22-01-2016, 10:51
Replies: 196
Views: 24,958
Posted By Derek Lumb
Re: How Not to Plan an Ocean Passage

In this part of the world (North Wales) and Cornwall too probably, the fishermen call yachtsmen WAFIs.

Wind Assisted F***ing Idiots.

It is normally an unwarranted insult but in this case I am...
Forum: Navigation 04-01-2016, 08:06
Replies: 46
Views: 27,353
Posted By Derek Lumb
Re: Calculating ACTUAL bridge clearance

Two more things for you to consider

Firstly builders data doesn't usually include the hardware on top of he mast - VHF antenna, wind vane head or lights.

Secondly the tidal height varies by...
Forum: Families, Kids and Pets Afloat 11-12-2015, 10:28
Replies: 36
Views: 13,086
Posted By Derek Lumb
Re: Sailing with a dog

We have sailed with 2 dogs, our first dog was 7 when we first took her on the boat and she never really settled. She was OK in calm weather but got really stressed if it was rough - panting and...
Forum: Marine Electronics 09-11-2015, 08:23
Replies: 24
Views: 7,851
Posted By Derek Lumb
Re: MMSI# After Selling Boat?

In the UK the MMSI goes with the boat so all you need to do if the equipment is staying on board is to surrender the license. The new owner applies for a new license and retains the MMSI number so no...
Forum: Dollars & Cents 07-11-2015, 09:17
Replies: 44
Views: 4,382
Posted By Derek Lumb
Re: Pre Pay 'Credit' Cards

I use a "Kalixa" prepay card for any high risk transactions. It costs nothing to load if you load it from your debit card and has a decent fx rate.

Credit card may carry protection, although...
Forum: Electrical: Batteries, Generators & Solar 22-04-2015, 02:50
Replies: 44
Views: 6,070
Posted By Derek Lumb
Re: Mystery major short circuit

Not if he didn't start the engine.

Also fuses are more of a black art than a science. A 100amp fuse is designed to take 100amps continuously. The short term rating is much greater than this so...
Forum: Plumbing Systems and Fixtures 16-03-2015, 10:49
Replies: 18
Views: 21,971
Posted By Derek Lumb
Re: Espar Heater wont ignite

The most common problem I have come across is too small wiring. The Eberspachers draw about 20 amps during start up and if the wiring is a bit on the long side the voltage drop in the wiring can be...
Forum: Marine Electronics 05-03-2015, 08:36
Replies: 75
Views: 10,678
Posted By Derek Lumb
Re: Have to haves and wants

I went through this last year with a new boat. For what it is worth I now regret some of the economies I made. As other posters have said, getting everything installed during build is easier and you...
Forum: Plumbing Systems and Fixtures 05-03-2015, 07:46
Replies: 30
Views: 7,543
Posted By Derek Lumb
Re: Holding Tank Pumpout -- "Rinse" Port?

It depends on the type of holding tank installation you have. If it is a gravity empty then one option is to pump out and then open the sea outlet and then pump out some more. The pump-out sucks...
Forum: Electrical: Batteries, Generators & Solar 03-03-2015, 11:02
Replies: 36
Views: 4,344
Posted By Derek Lumb
Re: Troubleshoothing help: Can't run appliances

There are two problems using the main engine for power generation alone. First it will be lightly loaded, 2kW is equivalent to <3HP so on a yacht with a 40Hp engine it is less than 10%loaded. This...
Forum: Seamanship & Boat Handling 02-03-2015, 08:37
Replies: 54
Views: 8,738
Posted By Derek Lumb
Re: Lowering Main in a Blow w/o Engine

I simply bring the boat close hauled and then let the main out until it is backwinded. I have a fully battened main and lazy jacks so I need to depower the main but the genoa funnels the wind onto...
Forum: Electrical: Batteries, Generators & Solar 26-02-2015, 07:37
Replies: 9
Views: 5,155
Posted By Derek Lumb
Re: Inverter connection to battery - Fused?

Yes - as others have said you fuse to protect the wiring. Rating is easy - fuses are not very precise but if you divide the rating of your inverter by 12 (assuming you have a 12v system) and round up...
Forum: Electrical: Batteries, Generators & Solar 02-02-2015, 11:10
Replies: 38
Views: 5,738
Posted By Derek Lumb
Re: Best generator for day-in/day-out use?

The power calculation will depend on what devices you will run simultaneously. If you have run all this lot on a marina supply, an upper limit on what is necessary would be the rating of the marina...
Forum: Europe & Mediterranean 24-01-2015, 08:17
Replies: 10
Views: 2,504
Posted By Derek Lumb
Re: Helgoland -- Port of Entry?

Technically you need to enter the Schengen zone whether you have a non EU citizen or just UK citizens on board. In practice no one will take much interest but you should get a (pink from memory) copy...
Forum: Fishing, Recreation & Fun 17-01-2015, 10:46
Replies: 60
Views: 9,778
Posted By Derek Lumb
Re: Sailing books to help get through the winter

For fiction try anything by Sam Llewelyn; or Bernard Cornwell (author of the Sharpe novels) has written 5 thrillers with a sailing background Sea Lord, Storm Child, Wildtrack, Crackdown and Scoundrel.
Forum: Engines and Propulsion Systems 11-01-2015, 09:47
Replies: 9
Views: 3,354
Posted By Derek Lumb
Re: Any new engines turn the Volvo way?

Several years ago I replaced my Volvo 2003 with a Yanmar 3JH4 and had the same dilemma. After several false starts I eventually had to accept that the old prop couldn't be used. The only thing I...
Forum: Navigation 11-01-2015, 09:24
Replies: 36
Views: 5,660
Posted By Derek Lumb
Re: Miles over ground or over water?

I can't imagine that the insurance company could care less - they just want a realistic view of your experience. I would go for the one which is easiest and be consistent (ie don't pick and choose...
Showing results 1 to 25 of 36
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